Stop device



April 17, 1934. c 5. BAKER 1,955,448

STOP DEVICE Filed June 1, 1932 INVENTOR. (71 4 1655 501381 H15 ATTORNEY.

Patented Apr, 37, 1934 UNITED STATES PATENT OFFICE STOP DEVICEApplication June 1, 1932, Serial No. 614,717

7 Claims.

This invention relates to a stop device and more particularly to adevice in the nature of a safety stop adapted to close a shutoff valvein the supply line of a steam engine or the like.

An object of the invention is to produce a simple, inexpensive devicereadily applicable to practically any type of supply line and capable ofbeing actuated either by electrical or mechanical means or by both suchmeans. Other objects will be either apparent or will be referred tohereinafter.

In the accompanying drawing, Figure 1 represents the plan view of theshut-off valve inserted in the supply line with a valve operatingmechanism shown in section and connected to a control device shown insection, and

Figure 2 is a sectional View of the shut-off valve and its operatingmembers taken on the line 22 of Figure 1 looking in the direction of thearrows, and

Figure 3 is a section of an actuating device taken on the line 3--3 ofFigure 1 looking in the direction of the arrows.

Referring to the drawing, a valve chest 5 of a type which may be readilyintroduced into a conduit is provided with a valve seat 7 and guides 9.A valve 11 having a lug 13 is loosely fitted between the guides 9 andadapted to seat upon the seat 7. A leakage port 12 is provided in thevalve 11 to permit of equalized pressure on each side of the valve whenclosed. Through the end of the lug 13 extends a pin 15, the ends ofwhich are engaged in slotted bores 17 in the ends of rocker arms 19 and21.

The arms 19 and 21 are formed integrally with a tube 23 through whichprojects an axis pin 25 suitably journaled in a transverse bore 27 ofthe casing 5. A downwardly tilted nose 19' forms a short arm of therocker 19 and an upwardly tilted nose 21' forms a short arm of therocker 21. The noses 19 and 21 extend into a chamber 29 in anenlargement 31 of the valve chest 5. Through the enlargement 31 is abore 33. The ends of a freely slidable shuttle 35 in the bore 33 areloosely fitted in the bore 33 to permit the passage of pressure fluidalong the shuttle into the ends of said bore.

The center of the shuttle 35 is greatly reduced and tapering surfacesjoin the reduced center to the enlarged ends. These tapering surfacesform cams l8 and 20, the cam 18 being adapted to actuate the nose l9 andthe cam 20 being adapted to actuate the nose 21 for opening and closingthe valve 11.

The right hand end of the shuttle 35 is provided with a recess 37inwhich is seated one end of a spring 39, the other end being seated uponthe end plate 41 of the bore 33. A pipe 43 having a pet-cock 45 isconnected to the left end of the bore 33, and a pipe 47 connects theright end of the bore 33 to a control device 49.

The control device 49 consists of a casing 51 in which is housed anelectromagnet 53 having suitable control wires 55 leading to a switch(not shown) which may be automatically controlled. Mounted in the casing51 on a bracket 57 is a trigger 59 which is connected to a cross headtrip (not shown) or other suitable governing mechanism by a rod 61. Thetrigger 59 is also connected by a spring 63 to an armature 65 of theelectromagnet 63.

A latch 67 of the trigger 59 engages a suitable recess in a rod 69slidably mounted in the casing 51. Connected to the rod 69 by a spring71 is a lever '73 which is keyed to a cam 75.

In the casing 51 is an auxiliary valve chest 77 having a bore 79therethrough. The bore79 is closed at the lower end by a plug 81 inwhich is seated the cam and which has a bore coaxial with the bore 79 inwhich is slidable a rod 83 8D the lower end of which rests upon the faceof the cam 75.

The upper end of the bore 79 is closed by a plug 85 having a boretherethro-ugh connecting with the pipe i7. In a recess in the plug 85 isseated one 85 end of a spring 87 the other end of which bears against aball 89, which is held against the spring by an extension 91 of the rod83.

An opening 93 intersects the bore 79 to form upper and lower seats forthe ball 89, the upper eat being formed in the plug 85 and the lowerseat being formed by shoulders in the bore 79 of the valve chest 77. Apipe 95 leads from the opening 93 and a pipe 97 leads from the lower endof the bore 79. 95

The operation of the device is as follows. When the parts are in theposition shown in the drawing the valve 11 is opened and is held in thatposition by the shuttle 35 which is at the extreme left of its stroke inthe bore 33. The chamber 29 100 and the bore 33 are open to steam orother pressure fluid from the interior of the valve chest 5 and as theshuttle 35 fits loosely in the bore 33 the pressure fluid passesfreelyabout it and the pressure is equalized at the opposite ends of theshuttle.

The valve 45 is closed so that there is no reduction of pressure at theleft end of the bore 33 and the ball valve 89 is held upon its upperseat in the valve chest 77 so that there is no leakage of fluid from theright hand end of the bore 33. The pressure on each side of the shuttlebeing equal, the balance is upset by the spring 39 which forces theshuttle to the left end of the bore, the nose 19 rides up on the cam 18and the tube 23 is rotated upon the axis pin 25 and the valve 11 islifted.

When operating circumstances become such that it is necessary to shutoff the supply of pressure fluid to the engine the governing device mayeither pull the rod 61 or may close the circuit to the electromagnet 53depending upon the type of governor employed. Either of these acts willserve to pull the trigger 59 and lift the latch 67 out of engagementwith the rod 69. The tension on the spring '71 and the pressure on theball 89 will tend to move the rod 69 to the right and the cam will berotated by its arm '73, permitting the rod 33 to drop.

The spring 8'7 then pushes the ball 89 from its upper seat and forces itagainst its lower seat thereby opening the fluid pressure conduit 47from the right end of the bore 33 and permitting the pressure to drop atthat end of the bore thereby enabling the pressure in the left end ofthe bore to drive the shuttle to the right overcoming the resistance ofthe spring 39. The cam 20 bears against the nose 21' at the same timethat the cam 18 is relieving its pressure upon the nose 19 with theresult that the tube 23 is rotated and the valve 11 forced down upon itsseat.

Fluid pressure forces the shuttle 35 to seat against the end plate 41thereby preventing continual leakage through the pipe 47 and theopen- 1. ing 93. While the shuttle 35 is held in this position the valve11 may not be opened until the equilibrium of the device isreestablished.

This is done by manually thrusting the rod 69 to the left andre-engaging the latch 67 thereby rotating the cam '7 5 and pushing therod 83 and its extension 91 upward in the bore 79, unseating the ball 89from its lower seat and reseating it upon its upper seat therebypreventing the further escape of pressure fluid from the right hand endof the bore 33. The pressure balance may then be restored in the bore 33and the shut-tle 35 may once more move to the left.

If the movement of the shuttle to the left should be dilatory owing tothe effective seating of the right end of the shuttle against the endplate 41 a momentary opening of the valve 45 will permit the exhaust ofpressure fluid from the left hand end of the bore 33. The shuttle,driven by the spring 39, will then move quickly to its left handposition thereby disengaging the cam 20 from the nose 21 and re-engagingthe cam 18 with the nose 19 and reopening the valve 11. The stopmechanism is once more in its original position and ready to act uponclosing of the circuit of the electromagnet 53 or in response to a pullon the rod 61.

The pipe 9'7 and its opening to the bore '79 are provided for thedrainage of the condensed steam from the bore '79.

Having thus described my invention and shown how the objectshereinbefore referred to have been accomplished I do not desire to berestricted to the precise form described. for it will be apparent tothose skilled in the art that many modifications may be made withoutdeparting from the spirit of the invention.

I claim:

1. A stop device for shut-off valves and the like, comprising a valvecasing, a main valve with valve operating means therein, a chamberhaving a bore communicating with the casing, a shuttle slidable in thebore, cambered faces on the shuttle adapted to engage the valveoperating means, means to constantly maintain pressru'e fluid balance onthe ends of the shuttle, resilient means bearing on one end of theshuttle to augment the pressure fluid acting against said end for movingthe same in the bore to cause operation of the valve in one direction,and means connected to one end of the core to unbalance the shuttlethereby permitting the pressure fluid acting against the other end ofthe shuttle to overcome the pressure of the resilient means to causeoperation of the main valve in the opposite direction.

2. A stop device for shut-01f valves and the like, comprising a valvecasing, a main valve with valve operating means therein, a chamberhaving a bore therein communicating with the casing, a shuttle slidablein the bore, cambered faces on the shuttle adapted to engage the valveoperating means, means to constantly maintain pressure fiuid balance onthe ends of the shuttle, resilient means bearing on one end of theshuttle to augment the pressure fluid acting against said end for movingthe shuttle in the bore for opening the valve, and an auxiliary valveconnected to one end of the bore to unbalance the shuttle and therebypermit the pressure fluid acting against the other end of the shuttle toovercome the pressure of the resilient means for closing the main valve.

3. A stop device for shut-off valves and the like, comprising a valvecasing, a main valve with valve operating means therein, a chamberhaving a bore communicating with the casing, a shuttle slidable in thebore, cambered faces on the shuttle adapted to engage the valveoperating means for opening and closing the main valve, means toconstantly maintain pressure fluid balance on the ends of the shuttle,resilient means bearing on one end of the shuttle to move the same inthe bore to open the valve, and a mechanically actuated auxiliary valveconnected to one end of the bore to exhaust the pressure fiuid therefromand thereby enable the pressure fluid acting against the other end ofthe shuttle to overcome the pressure of the resilient means and causethe shuttle to close the main valve.

4. A stop device for shut-off valves and the like, comprising a valvecasing, a main valve with valve operating means therein, a chamberhaving a bore communicating with the casing, a shuttle slidable in thebore, cambered faces on the shuttle adapted to engage the valveoperating means, means to constantly maintain pressure fluid balance onthe ends of the shuttle, resilient means bearing on one end of theshuttle to move the same in the bore to cause operation of the valve inone direction, and an electro-mechanically actuated auxiliary valveconnected to one end of the bore to exhaust the pressure fluid therefromand thereby enable the pressure fluid acting against the other end ofthe shuttle to overcome the pressure of the resilient means and causeoperation of the main valve in the opposite direction.

5. A stop device for shut-off valves and the like comprising a valvecasing, a main valve with valve operating means therein, a chamberhaving a bore therein, a shuttle slidable in the bore, inclined faces onthe shuttle to engage the valve operating means, means to constantlyadmit pressure fluid from the valve casing to both ends of the shuttleto balance the same, resilient means at one end of the shuttle to forceit to the opposite end of the bore to cause operation of the valve inone direction, and means connected to one end of the bore to overcomethe efiect of said resilient means and move the shuttle to causeoperation of the valve in the opposite direction.

6. A stop device for shut-01f valves and the like comprising a valvecasing, a main valve with valve operating means therein, a chamberhaving a bore therein, a shuttle slidable in the bore, inclined faces onthe shuttle to engage the valve operating means, means to constantlyadmit pressure fluid from the valve casing to both ends of the shuttleto balance the same, resilient means at one end of the shuttle to forceit to the opposite end of the bore to cause operation of the valve inone direction, a conduit leading from one end of the bore to permit flowof pressure fluid therefrom, an auxiliary valve controlling saidconduit, and mechanical means to open said auxiliary valve to permitunbalancing of the shuttle and consequent movement thereof against thepressure of the resilient means, thereby causing operation of the mainvalve in the opposite direction. '7. A stop device for shut-off valvesand the like comprising a valve casing, a main valve with valveoperating means therein, a chamber having a bore therein, a shuttleslidable in the bore, inclined faces on the shuttle to engage the valveoperating means, means to constantly admit pressure fluid from the valvecasing to both ends of the shuttle to balance the same, resilient meansat one end of the shuttle to force it to the opposite end of the bore tocause operation of the valve in one direction, a conduit leading fromone end of the bore to permit flow of pressure fluid therefrom, anauxiliary valve controlling said conduit, and electro-mechanical meansto open said auxiliary valve to permit unbalancing of the shuttle andconsequent movement thereof against the pressure of the resilient means,thereby causing operation of the main valve in the opposite direction.

CHARLES S. BAKER.

